/// <summary>
/// Adds engine average consumption refference line.
/// </summary>
/// <param name="helper"></param>
private void AddEnginesConsumptionTrendline(FusionChartsMultiSeriesHelper helper)
{
var trendline = new FusionChartsTrendline();
var avgConsumption = (from nivel in ReportObjectsList select nivel.Consumo).Average();
trendline.AddPropertyValue("startValue", string.Format("{0}", (int)avgConsumption));
trendline.AddPropertyValue("displayValue", string.Format("{0}: {1}lit", CultureManager.GetLabel("CONSUMO"), (int)avgConsumption));
trendline.AddPropertyValue("color", HexColorUtil.ColorToHex(Color.LightCoral));
trendline.AddPropertyValue("thickness", "3");
helper.AddTrendLine(trendline);
}